DFU implementation

[NB2655]

Please answer some questions below.

1. “Application” and “SoftDevice” can be replaced by DFU, correct?
2. Is Nordic DFU function inside “Module” (Orange colour part)?
3. If question 2 is yes then the hardware flow control must be implemented by host right ?

[Hung Bui]

Hi Nalin, 

1. Correct

2. No, it's running on the application area. DFU function requires a bootloader. The bootloader is a special application that can run even before the softdevice and can execute the real application if there is no DFU needed.

We have a short presentation on how DFU works here: https://devzone.nordicsemi.com/b/blog/posts/a-presentation-on-how-nrf51-dfu-works

3. Which bootloader are you asking about ? UART DFU or BLE DFU ? If it's UART it's possible to do without hardware flow control but the bitrate should be low enough.